US5146286A - Compact copy sheet input/output apparatus for an electrophotographic printing machine - Google Patents

Compact copy sheet input/output apparatus for an electrophotographic printing machine Download PDF

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Publication number
US5146286A
US5146286A US07/701,949 US70194991A US5146286A US 5146286 A US5146286 A US 5146286A US 70194991 A US70194991 A US 70194991A US 5146286 A US5146286 A US 5146286A
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US
United States
Prior art keywords
sheet
station
sheets
copy
paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/701,949
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English (en)
Inventor
James D. Rees
Thomas Acquaviva
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Assigned to XEROX CORPORATION reassignment XEROX CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ACQUAVIVA, THOMAS, REES, JAMES D.
Priority to US07/701,949 priority Critical patent/US5146286A/en
Priority to JP11589792A priority patent/JP3327575B2/ja
Priority to DE69215137T priority patent/DE69215137T2/de
Priority to EP92304372A priority patent/EP0514179B1/de
Publication of US5146286A publication Critical patent/US5146286A/en
Application granted granted Critical
Assigned to BANK ONE, NA, AS ADMINISTRATIVE AGENT reassignment BANK ONE, NA, AS ADMINISTRATIVE AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: XEROX CORPORATION
Assigned to JPMORGAN CHASE BANK, AS COLLATERAL AGENT reassignment JPMORGAN CHASE BANK, AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: XEROX CORPORATION
Anticipated expiration legal-status Critical
Assigned to XEROX CORPORATION reassignment XEROX CORPORATION RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: JPMORGAN CHASE BANK, N.A. AS SUCCESSOR-IN-INTEREST ADMINISTRATIVE AGENT AND COLLATERAL AGENT TO JPMORGAN CHASE BANK
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6552—Means for discharging uncollated sheet copy material, e.g. discharging rollers, exit trays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6502—Supplying of sheet copy material; Cassettes therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/15—Large capacity supports arrangements

Definitions

  • the present invention relates generally to an electrophotographic printing machine and, more particularly, to a compact apparatus for feeding copy media sheets into an image transfer zone and for receiving copy sheets from a fusing area.
  • a photoconductive member is charged to a substantially uniform potential so as to sensitize the surface thereof.
  • the charged portion of the photoconductive member is exposed to a light image of an original document being reproduced.
  • Exposure of the charged photoconductive member selectively dissipates the charge thereon in the irradiated areas resulting in the formation of an electrostatic latent image on the photoconductive member corresponding to the informational areas contained within the original document.
  • the latent image is developed by bringing a developer material into contact therewith.
  • the developer material comprises toner particles adhering triboelectrically to carrier granules.
  • the toner particles are attracted from the carrier granules to the latent image forming a toner powder image on the photoconductive member.
  • the toner powder image is then transferred from the photoconductive member to a copy sheet, which is fed from a copy sheet input section.
  • the toner particles are heated to permanently affix the powder image to the copy sheet.
  • the copy sheets are then delivered to a copy sheet output station where they may be simply stacked or where further operations, such as collating, stitching, or stapling may be performed.
  • the copy sheet input station generally incorporates a copy sheet feed tray or the like while the copy sheet output station generally incorporates a stacker tray/sorter or the like.
  • Each station has the common characteristic of encompassing an operational space which is only partially filled by copy sheets, the remainder of the space being vacant.
  • the total volume encompassed by a copy sheet input tray may be completely filled with sheets at full loading but as the sheet feeding operation progresses, the space occupied by the sheets progressively lessens until the sheets are completely fed out leaving an empty air space.
  • An analogous situation is present at the copy sheet stacker tray which is empty at the start of a copy operation and which gradually fills during operation.
  • the copy sheet input and output stations are, from an architectural viewpoint, not optimally designed. Since the unit manufacturing cost of commercial reprographic machines is substantially influenced by the size of the machine stations, it would be advantageous to make the copy sheet input and output stations as compact as possible. It would also be desired to optimize the efficiency of the folded type of architecture. According to the present invention, these objects are realized by incorporating the input and output stations into one compact apparatus which combines both functions.
  • the novel apparatus has a total volume which is filled with a combination of input copy sheets waiting to be fed into the transfer area of the copier and with copy sheets outputted from the fusing station. This concept is enabled by providing a variable boundary between the input and output stations.
  • variable boundary coincides with the bottom of a copy sheet stacker tray which moves in a vertical direction to advance into the area vacated by the copy sheets after they are fed out of the copy sheet supply tray.
  • the invention relates to an improved electrophotographic printing machine of the type in which a latent image is developed on a photoconductive member and a developed image transferred to a copy sheet and the developed image fixed at a fusing station, with successive copy sheets being supplied to said transfer station from a sheet loading station and exiting said fuser station into a sheet stacking station, whereby the improvement includes: a first, fixed surface for supporting the copy sheets being supplied to said transfer station and a second, variable surface overlying said fixed surface, said second surface being vertically movable.
  • FIG. 1 is a schematic side view of an illustrative electrophotographic printing machine incorporating the compact paper input/output apparatus of the present invention.
  • FIG. 2 shows a control circuit for controlling the operation of the input/output apparatus.
  • FIG. 3 is a view of the input/output apparatus of FIG. 1 in a fully loaded copy sheet input condition.
  • FIG. 4 is a view of the input/output apparatus of FIG. 1 with approximately 1/2 of the copy sheets being fed and stacked.
  • FIG. 5 is a view of the input/output apparatus of FIG. 1 after all of the copy sheets have been fed and stacked.
  • FIG. 6 is a view of the input/output apparatus of FIG. 1 in a position ready to be reloaded with copy sheets.
  • FIG. 7 is a front view of the input/output apparatus of FIG. 3.
  • FIG. 1 schematically depicts an electrophotographic printing machine incorporating the features of the present invention therein. It will become evident from the following discussion that the sheet delivery apparatus of the present invention may be employed in a wide variety of devices and is not specifically limited in its application to the particular embodiment or method of use depicted herein.
  • the electrophotographic printing machine 8 employs a photoconductive belt 10.
  • Belt 10 moves in the direction of arrow 12 to advance successive portions of the photoconductive surface of belt 10 sequentially through the various processing stations disposed about the path of movement thereof.
  • a corona generating device indicated generally by the reference numerals 14, charges the photoconductive belt 10 to a relatively high, substantially uniform potential.
  • a document handling unit indicated generally by the reference numeral 16
  • Document handling unit 16 sequentially feeds documents from a stack of documents placed by the operator face up in a normal forward collated order in the document stacking and holding tray.
  • a document feeder located below the tray forwards the bottom document in the stack to a pair of take-away rollers.
  • the bottom sheet is then fed by the rollers through a document guide to a feed roll pair and belt.
  • the belt advances the document to platen 18.
  • the original document is fed from platen 18 by the belt into a guide and feed roll pair.
  • the document then advances into an inverter mechanism and back to the document stack through the feed roll pair.
  • a position gate is provided to divert the document to the inverter or to the feed roll pair. Imaging of a document is achieved by lamps 20 which illuminate the document on platen 18. Light rays reflected from the document are transmitted through lens 22. Lens 22 focuses light images of the original document onto the charged portion of photoconductive belt 10 to selectively dissipate the charge thereon. This records an electrostatic latent image on the photoconductive belt which corresponds to the informational areas contained within the original document. Thereafter, belt 10 advances the electrostatic latent image recorded thereon to development station C.
  • copy sheets 29, fed from the input station of copy sheet input/output apparatus 30, are moved into contact with the toner powder image.
  • a detailed description of the apparatus 30 is provided below.
  • photoconductive belt 10 is exposed to a pre-transfer light from a lamp (not shown) to reduce the attraction between photoconductive belt 10 and the toner powder image.
  • a corona generating device 32 charges each copy sheet to the proper magnitude and polarity so that the copy sheet is tacked to photoconductive belt 10 and the toner powder image attracted from the photoconductive belt to the copy sheet.
  • corona generator 34 charges the copy sheet to the opposite polarity to detack the copy sheet from belt 10.
  • Fusing station E includes a heated fuser roll 50 and a pressure roll 52 with the powder image on the copy sheet contacting fuser roll 50.
  • the pressure roll is cammed against the fuser roll to provide the necessary pressure to fix the toner powder image to the copy sheet.
  • Decurler 54 bends the copy sheet in one direction to put a known curl in the copy sheet and then bends it in the opposite direction to remove that curl.
  • Forwarding rollers 56 then advance the sheet to the output station of input/output apparatus 30.
  • the apparatus consists of a housing 60 having a bottom surface 62 which serves as a support tray for an input stack 64 of copy sheets 29, which are to be inputted into the transfer station D.
  • the housing also incorporates fixed wall 66 and side guide 68 and front guide 70.
  • Guides 68, 70 are movable in and out (of the page) and left to right respectively to accommodate different size copy sheets.
  • a pair of vertically oriented machine lead screws 71, 72 (best seen in FIG. 7) are rotatedly mounted to the machine frame and are driven by stepper motors 74, 76, respectively, in a manner described below.
  • a variable copy sheet stacker tray 80 Rotating about the shaft of the lead screws 71, 72 and adapted to be driven in a vertical direction during operation is a variable copy sheet stacker tray 80.
  • a vacuum copy sheet feed unit 82 comprising a vacuum plenum 84, feed roll 86, feed belt 88, air knife 90, baffle 91, take away roll sensor 93 and take away roll pair 94.
  • An air supply from source 96 powdered by motor 96A is supplied to plenum 84 and air knife 90 via expansive bellows 95, 95A.
  • a height detector switch 97 Also mounted to the bottom of tray 80 is a height detector switch 97 having a height sensitive probe 98 contacting the top sheet of stack 64.
  • Upper and lower limit switches 100, 106 are mounted adjacent the path of travel of the edge of tray 80 and are adapted to be energized upon contacting tray 80.
  • Vacuum belt 104 holds the sheet in a flat position, feeding the leading edge between roller 107 and baffle 108 until it reaches the transfer station D where the developed image is transferred to the sheet. The sheet is then carried by vacuum belt 46 through fuser station E.
  • each sheet proceeds through baffle 91 and is engaged by roller pair 94 bringing the sheet into contact with transport belt 104.
  • Belt 104 moves slightly faster than the roller pair 94 rotation to ensure that a buckle does not form at the interface.
  • Roll sensor 93 is positioned to detect misfeed or jam at the feeder/vacuum transport interface, and send appropriate signals to controller 110.
  • FIG. 4 shows apparatus 30 at a point approximately midway through a copy cycle where the copy sheet input stack 64 has been partially depleted, but where copy sheet output stack 64' has been formed. Stacks 64 and 64' can be considered to be waning and waxing respectively during operation.
  • FIG. 5 shows the condition of apparatus 30 at the end of the copy/feed cycle when stack 64 has disappeared (been depleted) leaving stack 64' occupying the same volume originally filled by stack 64 shown in FIG. 3.
  • FIG. 4 shows apparatus 30 after approximately 1/2 of the sheets from initial stack 64 have been fed and then returned, after processing, into output stack 64'.
  • tray 80 has been indexed downward by successive lead screws 71, 72, incremental rotations carrying paper feed unit 82 to the position shown.
  • unit 82 acts as a variable position vacuum transport; paper fed from the unit can be engaged at any point along the vertical surface of transport belt 104.
  • the input and output (feed and return stacks) sections of apparatus 30 are functionally independent of copy sheet weight and copy sheet thickness characteristics; e.g. a thicker copy sheet will increment the feed unit 80 downward at a faster rate than a thinner sheet but the stacker tray 80 will also move downward at a correspondingly faster rate 80 so that there is always the same distance, d, as shown.
  • input stack 64 will finally become exhausted as shown in FIG. 5 and output stack 64' is at maximum.
  • stacker tray 80 engages lower limit switch 106, sending a display to the machine control panel 114 alerting an operator and deactivating stepper motors 74, 76.
  • Controller 110 also stops machine operation until the copy sheet input supply is replenished. At this point, the operator will open the front door, and remove the copy sheet output stack 64'.
  • a sensor 109 fixed in position on tray 80, detects that the tray is empty (stack 64' has been removed).
  • motors 74, 76 are energized to drive the screws 71, 72 in an opposite, return direction rapidly returning tray 80 to the position originally established in FIGS. 1, 3.
  • the tray motion stops when upper limit switch 100 is contacted and energized.
  • the tray 80 thus operates at two speeds, slow (index down) and a fast (return up).
  • the operator can then open the door and reload copy sheets onto floor 62, forming a new stack 64, close the door and resume machine operation.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)
US07/701,949 1991-05-17 1991-05-17 Compact copy sheet input/output apparatus for an electrophotographic printing machine Expired - Fee Related US5146286A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US07/701,949 US5146286A (en) 1991-05-17 1991-05-17 Compact copy sheet input/output apparatus for an electrophotographic printing machine
JP11589792A JP3327575B2 (ja) 1991-05-17 1992-05-08 電子写真印刷機、給紙装置及び給紙入出力装置
DE69215137T DE69215137T2 (de) 1991-05-17 1992-05-14 Blatthandhabungsgerät
EP92304372A EP0514179B1 (de) 1991-05-17 1992-05-14 Blatthandhabungsgerät

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/701,949 US5146286A (en) 1991-05-17 1991-05-17 Compact copy sheet input/output apparatus for an electrophotographic printing machine

Publications (1)

Publication Number Publication Date
US5146286A true US5146286A (en) 1992-09-08

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Application Number Title Priority Date Filing Date
US07/701,949 Expired - Fee Related US5146286A (en) 1991-05-17 1991-05-17 Compact copy sheet input/output apparatus for an electrophotographic printing machine

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US (1) US5146286A (de)
EP (1) EP0514179B1 (de)
JP (1) JP3327575B2 (de)
DE (1) DE69215137T2 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363971A (en) * 1992-10-16 1994-11-15 United States Postal Service Automatic carrier sequence bar code sorter
US5941518A (en) * 1994-12-12 1999-08-24 Xerox Corporation Sheet feeder with variable length, variable speed sheetpath
US6325369B1 (en) 1998-09-30 2001-12-04 Xerox Corporation Sheet feeding apparatus
US20020135793A1 (en) * 2001-01-19 2002-09-26 Walgrove George R. Apparatus and method for a programmable detack charging system
US20050084307A1 (en) * 2003-10-21 2005-04-21 Kabushiki Kaisha Toshiba Image forming apparatus
US20070096386A1 (en) * 2005-10-31 2007-05-03 Brother Kogyo Kabushiki Kaisha Printer with sheet returning mechanism
CN100351154C (zh) * 2004-02-12 2007-11-28 兄弟工业株式会社 记录介质供给装置和成像装置
US7559549B2 (en) 2006-12-21 2009-07-14 Xerox Corporation Media feeder feed rate

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3479429B2 (ja) * 1997-03-04 2003-12-15 株式会社リコー 給紙装置
JP4838216B2 (ja) * 2007-09-18 2011-12-14 シャープ株式会社 用紙搬送装置、及びこれを備えた画像形成装置

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050805A (en) * 1975-11-18 1977-09-27 Eastman Kodak Company Electrophotographic copying apparatus for two-sided copying
US4083553A (en) * 1976-11-22 1978-04-11 Pitney-Bowes, Inc. Copy sheet handling apparatus for a copier
US4221374A (en) * 1977-08-04 1980-09-09 Siemens Aktiengesellschaft Device for moving sheet data carriers from and to stacks of sheets
US4350333A (en) * 1980-07-11 1982-09-21 Savin Corporation Large-capacity sheet-stacking apparatus
US4473314A (en) * 1983-02-02 1984-09-25 Mamoru Imaizumi Printing apparatus responsive to paper feeding device position
US4640502A (en) * 1981-12-29 1987-02-03 International Business Machines Corporation Envelope hopper for feed and delivery
JPS6288739A (ja) * 1985-10-11 1987-04-23 Fuji Xerox Co Ltd 複写機
JPS62130931A (ja) * 1985-12-03 1987-06-13 Nec Corp 紙葉類繰出集積機構
US4715595A (en) * 1984-12-28 1987-12-29 Kabushiki Kaisha Toshiba Apparatus for feeding paper sheets from a paper stock to a printer or reader
JPH01192662A (ja) * 1988-01-28 1989-08-02 Konica Corp デジタル複写機
US4854232A (en) * 1986-10-13 1989-08-08 Dainippon Screen Mfg. Co. Ltd. Method and apparatus for multi-color printing
US4926220A (en) * 1988-10-17 1990-05-15 Xerox Corporation Dual mode set delivery apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3989236A (en) * 1973-12-13 1976-11-02 Canon Kabushiki Kaisha Copying machine
JPS6194953A (ja) * 1984-10-12 1986-05-13 Ricoh Co Ltd 転写紙供給装置
US4934681A (en) * 1988-11-22 1990-06-19 Xerox Corporation Hybrid output duplex copying system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050805A (en) * 1975-11-18 1977-09-27 Eastman Kodak Company Electrophotographic copying apparatus for two-sided copying
US4083553A (en) * 1976-11-22 1978-04-11 Pitney-Bowes, Inc. Copy sheet handling apparatus for a copier
US4221374A (en) * 1977-08-04 1980-09-09 Siemens Aktiengesellschaft Device for moving sheet data carriers from and to stacks of sheets
US4350333A (en) * 1980-07-11 1982-09-21 Savin Corporation Large-capacity sheet-stacking apparatus
US4640502A (en) * 1981-12-29 1987-02-03 International Business Machines Corporation Envelope hopper for feed and delivery
US4473314A (en) * 1983-02-02 1984-09-25 Mamoru Imaizumi Printing apparatus responsive to paper feeding device position
US4715595A (en) * 1984-12-28 1987-12-29 Kabushiki Kaisha Toshiba Apparatus for feeding paper sheets from a paper stock to a printer or reader
JPS6288739A (ja) * 1985-10-11 1987-04-23 Fuji Xerox Co Ltd 複写機
JPS62130931A (ja) * 1985-12-03 1987-06-13 Nec Corp 紙葉類繰出集積機構
US4854232A (en) * 1986-10-13 1989-08-08 Dainippon Screen Mfg. Co. Ltd. Method and apparatus for multi-color printing
JPH01192662A (ja) * 1988-01-28 1989-08-02 Konica Corp デジタル複写機
US4926220A (en) * 1988-10-17 1990-05-15 Xerox Corporation Dual mode set delivery apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363971A (en) * 1992-10-16 1994-11-15 United States Postal Service Automatic carrier sequence bar code sorter
US5941518A (en) * 1994-12-12 1999-08-24 Xerox Corporation Sheet feeder with variable length, variable speed sheetpath
US6325369B1 (en) 1998-09-30 2001-12-04 Xerox Corporation Sheet feeding apparatus
US20020135793A1 (en) * 2001-01-19 2002-09-26 Walgrove George R. Apparatus and method for a programmable detack charging system
US20050084307A1 (en) * 2003-10-21 2005-04-21 Kabushiki Kaisha Toshiba Image forming apparatus
US6965750B2 (en) * 2003-10-21 2005-11-15 Kabushiki Kaisha Toshiba Image forming apparatus
CN100351154C (zh) * 2004-02-12 2007-11-28 兄弟工业株式会社 记录介质供给装置和成像装置
US20070096386A1 (en) * 2005-10-31 2007-05-03 Brother Kogyo Kabushiki Kaisha Printer with sheet returning mechanism
US7559549B2 (en) 2006-12-21 2009-07-14 Xerox Corporation Media feeder feed rate

Also Published As

Publication number Publication date
DE69215137T2 (de) 1997-03-27
JPH05155536A (ja) 1993-06-22
EP0514179A2 (de) 1992-11-19
DE69215137D1 (de) 1996-12-19
EP0514179A3 (en) 1993-01-20
JP3327575B2 (ja) 2002-09-24
EP0514179B1 (de) 1996-11-13

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